Brush having adjustable hardness

ABSTRACT

Brush having adjustable bristle hardness includes a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on the one side of the bristle plate and formed with a multiplicity of perforations through which the bristle brushes, respectively, extend; a cover member located on the other side of the bristle plate; an adjusting wheel disposed between the bristle plate and the cover member; and threaded connecting means extending between the perforated plate and the adjusting wheel and cooperable with the latter for adjustably spacing the perforated plate and the bristle plate at varying distances from one another.

United States Patent [191 Weihrauch BRUSH HAVING ADJUSTABLE HARDNESS Georg Weihrauch, Aschbach, Germany Assignees: Coronet-Werke Heinrich Schlerf Gmbl-l, Waldmechelbach/Odenw., Germany Filed: Feb. 15, 1972'" Appl. No.: 226,596

inventor:

[22] uwfi [30] Foreign Application Priority Data Feb. 18, 1971 Germany 2107900 US. Cl. 15/169, 132/119 Int. Cl A46b 9/08 Field of Search... 15/159, 160, 168, 169, l5/l76, 184, 186, 187, 188,143, 145,193, 180; 401/75, 78; 132/119, 121

[56] References Cited UNITED STATES PATENTS 2,168,235 8/l939 Oshmanetal 132/121 [111 3,803,663 [451 Apr. 16, 1974 2,660,183 11/1953 Gruring l5/l69 2,963,724 12/1960 Davis 3,612,705 10/1971 Duval 3,678,529 7/1972 Woods et al 15/169 X FOREIGN PATENTS OR APPLICATIONS 81 l/l886 Great Britain 15/169 Primary Examiner-Peter Feldmah Attorney, Agent, or Firm-Herbert L. Lerner [5 7] ABSTRACT Brush having adjustable bristle hardness includes a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on the one side of the bristle plate and formed with a multiplicity of perforations through which the bristle brushes, respectively, extend; a cover'member located on the other side of the bristle plate; an adjusting wheel disposed between the bristle plate andthe cover member; and threaded connecting. means extending between the perforated plate and the adjusting wheel and cooperable with the latter for adjustably spacing the perforated plate and the bristle plate at varying distances from one another.

12 Claims, 2 Drawing Figures PKTENTEDAPR 16 m4 SHEET 1 [IF 2 PATENTEDAPR 16 19M 3803L663 sumanrz MAGNETIC com; MEMORY BACKGROUND OF THE INVENTION This invention relates to magnetic core memory stacks, and more particularly to an improved structure for core planes of a stack.

A typical magnetic core memory is comprised of a stack of toroidal core planes. In each plane, the cores are arranged in rows and columns. Each core is oriented at 45 with respect to the rows and columns to facilitate threading the cores with conductors along the rows and columns and as well as long diagonal paths if desired. For example, in a typical coincident current core memory, each plane consists of a matrix of toroidal cores arranged in rows and columns. All cores in a given row are threaded by a common conductor to provide a single turn winding through each core. Similarly all cores in a given column are threaded by a common conductor. The two sets of conductors are referred to as the X and Y drive windings.

To store a bi nar y l ina selected core of a give n plane,

the X and Y drive windings which cross at the selected core are each driven with a current pulse of half the amplitude necessary to set the core to the one state. All of the other cores wired by the energized X and Y drive windings are disturbed, but not set to the one state since each is subjected to a magnitomotive force of only half the value necessary to set it to the one state. To read a binary digit stored in a selected core, the X and Y drive windings which cross at the selected core are each driven with a current pulse of half the amplituderegu ired to change the state of the selected core to that opposite the binary-1 state. A third winding (Z) passing through all of the cores of thgplane diagonally senses a binary 1 being read from the selected core. A fourth winding (I) passing through all of the cores in the plane in a direction parallel to the X or the Y winding is used to selectivelyinhibitthe storage of a binary 1 in a core of a selected plane.

Other patterns for threading cores with conductors have been employed for magnetic core memories of different types, such as the linear-select type, or what has come to be known as a 2 k D type. Foreach type, it is common practice to stand the cores of a plane on end, and to orient them at 45 to the rows and columns in a box or herringbone pattern to facilitate threading the cores along the rows and columns, and sometimes along a diagonal, as in the case of a typical four-wire, coincident-current core memory.

The practice has been to arrange the cores into the desired array pattern by placing a handful of cores (typically to mils in diameter) on a plate in a tray. The plate has slots in the desired pattern so that as the tray is vibrated, the cores fall into the slots. The slots are narrow, but almost as deep as the core diameter. For example, using a 20-mil core, the slots may be 18 mils deep so that when a core falls into a slot, it stands on end and protrudes sufficiently for a sheet of flexible material with an adhesive film to be used to remove the array of cores from the plate. Once a core has fallen into every slot in the tray, any excess cores are removed and the adhesive sheet is pressed against all of the cores. By carefully turning the plate upside down on a work table or board, and then carefully lifting the plate, the desired core array pattern is left adhesively affixed to the sheet with each core standing on end. The array is then transferred to a substrate coated with a suitable adhesive, such as RTV, a silicone rubber compound produced by the General Electric Company, or a lac quer. That is done by placing the adhesive sheet on the substrate with the cores pressed against the adhesive'on the substrate. Then the adhesive plate is peeled off. Any cores which do not stay "on the substrate must be replaced and aligned by hand, a difficult task. The desired windings through the cores are then provided. Core memory planes thus individually formed are placed on supporting printed-circuit boards, or the like, through which connections are madeto the core windings. The completed memory plane boards are then stacked to provide a magnetic core memory of the desired size.

A magnetic plate is sometimes used instead of an adhesive sheet to lift the array of cores from the slots in the vibrating-tray plate. The array is then transferred to a substrate as before. An advantage of this technique is that cores are less apt to fail to adhere to the substrate, but a disadvantage is that if one core tilts too much, an unbalanced field is produced which will cause it to tilt further until it falls against an adjacent core. That further disturbs this field and quite often an entire row of cores will fall like a row of dominoes. For this reason, magnetic plates are not often used as. a transfer vehicle. I

SUMMARY O THE INVENTION I An object of this invention is to provide a slotted plate which may be used on a standard vacuumvibrator for arranging coresin a desired array'pattern, and thereafter used as a substrate for the array while threading cores with desired windings.

Another object of this invention is to provide an improved structure for a plane in a magnetic core memory using a slotted plate to support the cores, and to provide a method of fabricating such a plate.

Briefly, in accordance with one aspect of the present invention, a slotted plate is fabricated out of a sheet of plastic or other nonmagnetic material. The sheet is masked using photo resist techniquesand then chemically etched to produce the desired pattern of slots. The slot pattern of the mask is virtually identical with a plan view of the desired core array. Only thesize of the slots in width and length deviates from the thickness and outside diameter of the cores, and the deviation is preferably that of smaller dimensions. This chemical etching produces slots with walls which are invariably tapered to permit capture of toroidal cores on a vacuum vibrator, but not allow the cores to pass through the slots. Before using the etched plate on a vacuum vibrator, the resist is removed from the plate.

After cores have been vacuum vibrated into proper position in all slots, a gentle mist of an adhesive is sprayed over the cores to hold them in place without obstructing the apertures of the cores. Then a heavier layer of adhesive is applied between the cores and the plate from the side opposite the cores, again without obstructing the core apertures, preferably by cementing the core plate to a substrate which may be a printed circuit board or frame assembly plate, through which connections are madeto windings threaded through the cores. The cores may be threaded either before or after the slotted plate is cemented to the substrate, but preferably afterwards. Then the adhesive sprayed over the cores may be removed with a solvent before thread- Other features which are considered as characteristic forthe invention are set forth in the appended claims.

Although the invention is illustrated and described herein as-embodied in brush having adjustable hardness, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

The construction and method of operation of the invention, however, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:' v

1 FIG. 1 is an exploded elevational view, partly in section, of the brush having adjustable hardness, constructed in accordance with the invention; and

' FIG. '2 is a bottom plan view of the cover member of FIG. 1'. i v

Referring now to the drawing, there is shown therein the brush constructed in accordance with theinvention which has four main parts including a cover member-l, a bristle plate 2, a perforated plate 3 and an adjusting wheel 4 that are sandwiched together. The perforated plate 3 is provided with four guide pins 6 guidingly extending through openings 18 formed in the bristle plate 2and into bored recesses formed in the cover member 1. By turning the adjusting wheel 4, the perforated plate 3 is raised or lowered, as viewed in FIG. 1, so that a desired length s of the bristles '7 can be adjusted to.

The raising or lowering of the perforated plate 3 is achieved by means of a slide projection 15 extending radially'inwardly within a hollow shaft 14 secured to the adjusting wheel 4,-the slide projection 15 engaging in the thread-groove 17 formed on the threaded pin 16 which is substantially centrally secured to the perforated plate 3. A depression 20 is formed in the cover member 1 having a larger diameter than the width of the brush handle part at the top of the cover member I so thatga recess is formed onboth lateral sides of the cover member 1 through which the adjusting wheel 4 protrudesi The recess 5 formed in the cover'member 1 becomes even larger if an elongated indentation 21 L is provided in the cover member 1. This indentation 21 is registrable with a corresponding indentation 21 formed in the bristle plate 2, forming together a groove which ensures a bettermanipulation and gripping of the brush. Asa bearing for the adjusting wheel 4, a recess 13 is formed in the-cover member 1 wherein there is fitted a pin 12 formed at the upper surface of the adjusting wheel 4. Locking of the perforated plate 3 in a desired position is achieved by a knurl or small teeth 8 and 9 which are located, respectively, at the underside of the adjusting wheel 4 and at a raised annular area formed on the upper side ofthe bristle plate 2. To limit I the rotation of 'the adjusting wheel 4, respective mutually engageable limit pins 10 and 11 are provided at the underside of the adjusting wheel 4 and at the upper side of the bristle plate 2.

I claim: I r

'1. Brush having adjustable bristle hardness, comprising a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on said one side of said bristle plate and formed with a multiplicity of perforations through which said bristle brushes, respectively, extend; a cover member located on the other side of said bristle plate; an adjusting wheel disposed between said bristle plate and said cover member and extending diametrically in a plane substantially perpendicular to said bristle brushes; and threaded connecting means extending between said perforated plate and said adjusting wheel and cooperable with the latter for adjustably spacing said perforated plate and said bristle plate at varying distances from one another.

2. Brush according to claim 1 wherein said threaded connecting means comprises a threaded pin secured substantially centrally to said perforated plate and extending through a substantially central opening formed in said bristle plate, and a hollow shaft secured to said adjusting wheel and formed with a radially inwardly extending slide projection, said threaded pin being received in said hollow shaft, said slide projection being slidingly received in the thread formed on said threaded pin, and said adjusting wheel being tumable so as to transmit an adjusting force through said slide projection to said threaded pin.

3. Brush according to claim 1 wherein said adjusting wheel is received in a depression formed in said cover member and has a diameter greater than the width of the brush.

4. Brush according to claim 1 wherein said adjusting wheel is provided with a pin located at a side thereof opposite the hollow shaft secured thereto, said pin of said adjusting wheel engaging in a corresponding recess formed in said cover member and forming a bearing for said adjusting wheel.

5. Brush according to claim 1 wherein said adjusting wheel has a diameter at least equal to the width of the brush.

6. Brush according to claim 1 including mutually engaging serrations formed on said adjusting wheel and said bristle plate.

7. Brush according to claim 6 wherein said serrations comprise a knurlformed on the side of said adjusting wheel facing said bristle plate, and aknurl formed on the opposing side of said bristle plate.

8. Brush according to claim 7 wherein said knurl of said adjusting wheel is provided within a depression formed in said adjusting wheel, and said knurl of said bristle plate is formed on a raised annular surface of said opposing side of said bristle plate.

9. Brush according to claim 1 wherein one rotation of said adjusting wheel corresponds to maximum adjustable distance between said perforated plate and said bristle plate.

10. Brush accordingto claim 1 wherein said cover member and said bristle plate are elongated and have lateral elongated sides formed with elongated indentations.

11. Brush according to claim 1 includes guide pins secured to said perforated plate and guidingly extending through corresponding openings formed in said bristle plateand into corresponding recesses formed in said cover member.

12. Brush according to claim 9 including mutually engageable limit pins located respectively on said bristle plate and said adjusting wheel for limiting rotation of said adjusting wheel.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patmm No. 3,805,663 Datai April l6 l974 lnvmumr(s) Georg Welhrauch It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Cancel Columns 1 and 2, bearing Patent No. 3,803,563 and insert the following:

BRUSH HAVING ADJUSTABLE HARDNESS Abstract of the Disclosure Brush having adjustable bristle hardness includes a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on the one side of the bristle plate and formed with a multiplicity of perforations through which the bristle brushes, respectively, extend; a cover member located on the other side of the bristle plate; and adjusting wheel disposed between the bristle plate and the cover member;

and threaded connecting means extending between the perforated plate and the adjusting wheel and cooperable with the latter for adjustably spacing the perforated plate and the bristle plate 'varying distances from one another.

FORM PO- 053 (IO-69 USCOMM-DC 60376-P69 US GOVERNMENT PRINTING OFFICE: 865L910 PatentNo. 3,803,663 Dated p 16,1974

Georg Weihrauch Page 2 Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

The invention relates to brush having adjustable bristle hardness and, more particularly, of such a brush having a brush body, a bristle plate, a perforated plate and a cover, the perforated plate being adjustable with respect to the bristle plate.

The purpose of providing a brush wherein the effective length of the bristles is adjustable, is

especially to obtain greater stiffness of the bristles for certain specific operations and to combine the advantages of a brush having long bristles and a brush having short bristles. Such a brush can be used to advantage wherever a change from hard to soft bristles is desired during the use thereof, especially cloth brushes, massage brushes,

brooms, hand-scrubbing or washing brushes, hairbrushes, toothbrushes and the like. Soft, delicate materials require, for example, more -gentle handling than FORM PO-105-9 (10-69) USCOMM-DC 60376-P69 u.s sovzrmmzm PRINTING OFFICE: 93 o UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO. Dated Inventofls) Georg Weihrauch Page 3 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

a coarse material that has been greatly soiled and which calls for the use of thicker or shorter bristles for cleaning the same For slightly soiled skin, for example, a hard scrubbing or washing brush with long, soft bristle is preferred, but for cleaning very dirty hands, a brush with short, i.e. hard, bristles is required and demanded.

The adjustability of hardness of the effective lengths of bristles becomes important as the service life or durability of the bristle material is increased. Only when the quality of the synthetic fibers of which the bristles may be formed is high, is the additional cost of the adjusting mechanism justified, because the better cleaning effectiveness that is attained can thereby be used over a relatively longer period of time To achieve greater stiffness of the bristles it FORM PC4050 (10-69) USCOMM-DC 60376-P69 U.Sv GOVERNMENT PRINTING OFFICE UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 803 ,663 Dated Apri 16 19 74 Inventor s Georg Weihrauch P 4 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

has been known heretofore to vary the effective length of the bristles by means of a perforated plate which is adjustably disposed between the brush body and a specific location of the bristle length.

It has been found to be a disadvantage of this heretofore known construction, that the mechanism for adjusting the bristle hardness or stiffness is too complicated and that the brush is unwieldy because of disturbing operating or serviceing parts thereof. Furthermore, the

adjustment with the heretofore known mechanisms of this general type is either too easy so that it tends to shift just as easily, or is too difficult to effect, and a selected position of the perforated plate cannot be locked It is accordingly an object of the invention to provide a brush having adjustable hardness which is F ORM PO-105D(1069) USCOMM-DC 60376-P69 uls. GOVERNMENT PRINTING orncs: 93 O UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,803,663 man Inventofls) Georg Weihrauch p 5 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

adjustable in the height thereof, which has an adjusting mechanism provided with a minimum number of parts and disposed, furthermore, inside the brush housing, leaving the brush handle region free of interfering parts. A further object of the invention is to provide such a brush which affords easy adjustment of the effective bristle length,

while simultaneously, providing for satisfactory locking of the selected operating position of the perforated plate with respect to the bristle plate.

With the foregoing and other objects in view, there is provided in accordance with the invention, brush having adjustable bristle hardness, comprising a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on the one side of the bristle plate and formed with a multiplicity of perforations through which the bristle brushes, respectively, extend; a

cover member located on the other side of the bristle plate;

ORM PO- C-59 (IO-G91 USCOMM-DC 60376-F'69 u s GOVERNMENY PRINTING OFFICE: 0

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 803 Dated April l 6 1974 Georg Weihrauch Page 6 Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

an adjusting wheel disposed between the bristle plate and the cover member; and threaded connecting means extending between the perforated plate and the adjusting wheel and cooperable with the latter for adjustably spacing the perforated plate and the bristle plate at varying distances from one another.

In accordance with another feature of the invention,

the threaded connecting means comprises a threaded pin secured substantially centrally to the perforated plate and extending through a substantially central opening formed in the bristle plate, and a hollow shaft secured to the adjusting wheel and formed with a radially inwardly extending slide projection, the threaded pin being received in the hollow shaft, the slide projection of the latter being slidingly received in the thread formed on the pin, the

adjusting wheel being turnable so as to transmit an adjusting ORM 1 0-1050 (10-69) USCOMMDC 60375-P69 0.5v GOVERNMENT PRINTING OFFICE B 9 g o UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 a 803 Dated April 16 19 Georg Weihrauch Page 7 Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

force through the slide projection to the threaded pin.

By means of this last-described feature, the

adjusting wheel is conveniently adjustable with the fingers of the hand grasping the brush, without impairing the customary manipulation of the brush.

In accordance with a further feature of the invention,

the adjusting wheel is received in a depression formed in the cover member and has a diameter that vis greater than the width-of the brush so that, at opposite sides of the cover member, part of the adjusting wheel is exposed.

The adjusting wheel is, furthermore, preferably knurled at the periphery thereof.

In accordance with an added feature of the invention,

and in order to absorb axial forces during adjustment of the perforated plate the adjusting wheel is advantageously supported by a pin located at a side thereof opposite the FORM PO-105O (Hi-G9) USCOMM'DC 60376-P69 U.S GOVERNMENY PRINTING OFFICE: 9 930 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 a 803 a 663 D d April 6 1974 P lnventofls) Georg weihrauch age 8 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

hollow shaft secured thereto, the pin of the adjusting wheel engaging in a corresponding recess formed in the cover.

In accordance with yet another feature of the invention,

the cover member has a handle portion at the side thereof facing away and oposite lateral surfaces of the cover member and the bristle plate are formed with respective recesses in the region of the handle so as to afford good gripping of the handle as well as effective operation of the adjusting wheel, without requiring the latter to have a diameter exceeding the width of the brush.

In accordance with a concomitant feature of the invention, the adjusting wheel is provided with means for locking the perforated plate, comprising serrations or knurling, respectively, located at the side of the adjusting wheel facing the bristle plate, and engaging with corresponding serrations or knurling on the opposing side of FORM PO-IOSQ (IO-69) USCOMM-DC 60376-5 69 US GOVERNMENY PRINTING OFFICE- 869-930 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 a 803 D d April 16 a 9 74 Inventor s Georg weihrauch Page 9 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

the bristle plate The threaded connection means are preferably formed with a pitch or lead by which one revolution of the adjusting wheel corresponds to the maximum adjustable spacing between the perforated plate and the bristle plate.

In accordance with another feature of the invention,

four guide pins are secured to the perforated plate and guidingly extend through corresponding holes. formed in the bristle plate and into corresponding recesses formed in the cover member so as to avoid canting of the plates and the cover member during the adjustment of the perforated plate Since the perforated plate is suspended only from the slide projected traveling in the thread formed on the threaded pin of the perforated plate the rotation of the adjusting wheel is thereby limited.

Signed and Scaled this [SEAL] thirieh D3) Of September1975 A Nest.

RUTH C. MASON Allesling Officer C. MARSHALL DANN mnmisxwnvr Hfl'altllls and Trademark-x F ORM PO-IC-S') IIO-GSI USCOMM'DC 60376-P69 US. GOVERNMENT PRINTING OFFICE: 

1. Brush having adjustable bristle hardness, comprising a bristle plate having a multiplicity of bristle brushes extending from one side thereof; a perforated plate located on said one side of said bristle plate and formed with a multiplicity of perforations through which said bristle brushes, respectively, extend; a cover member located on the other side of said bristle plate; an adjusting wheel disposed between said bristle plate and said cover member and extending diametrically in a plane substantially perpendicular to said bristle brushes; and threaded connecting means extending between said perforated plate and said adjusting wheel and cooperable with the latter for adjustaBly spacing said perforated plate and said bristle plate at varying distances from one another.
 2. Brush according to claim 1 wherein said threaded connecting means comprises a threaded pin secured substantially centrally to said perforated plate and extending through a substantially central opening formed in said bristle plate, and a hollow shaft secured to said adjusting wheel and formed with a radially inwardly extending slide projection, said threaded pin being received in said hollow shaft, said slide projection being slidingly received in the thread formed on said threaded pin, and said adjusting wheel being turnable so as to transmit an adjusting force through said slide projection to said threaded pin.
 3. Brush according to claim 1 wherein said adjusting wheel is received in a depression formed in said cover member and has a diameter greater than the width of the brush.
 4. Brush according to claim 1 wherein said adjusting wheel is provided with a pin located at a side thereof opposite the hollow shaft secured thereto, said pin of said adjusting wheel engaging in a corresponding recess formed in said cover member and forming a bearing for said adjusting wheel.
 5. Brush according to claim 1 wherein said adjusting wheel has a diameter at least equal to the width of the brush.
 6. Brush according to claim 1 including mutually engaging serrations formed on said adjusting wheel and said bristle plate.
 7. Brush according to claim 6 wherein said serrations comprise a knurl formed on the side of said adjusting wheel facing said bristle plate, and a knurl formed on the opposing side of said bristle plate.
 8. Brush according to claim 7 wherein said knurl of said adjusting wheel is provided within a depression formed in said adjusting wheel, and said knurl of said bristle plate is formed on a raised annular surface of said opposing side of said bristle plate.
 9. Brush according to claim 1 wherein one rotation of said adjusting wheel corresponds to maximum adjustable distance between said perforated plate and said bristle plate.
 10. Brush according to claim 1 wherein said cover member and said bristle plate are elongated and have lateral elongated sides formed with elongated indentations.
 11. Brush according to claim 1 includes guide pins secured to said perforated plate and guidingly extending through corresponding openings formed in said bristle plate and into corresponding recesses formed in said cover member.
 12. Brush according to claim 9 including mutually engageable limit pins located respectively on said bristle plate and said adjusting wheel for limiting rotation of said adjusting wheel. 